6[1]Witter FR.Prostaglandin E2 preparation for preinduction cervical ripening Clinical.Obstet Gynecol,2000,43(3):469-474
7Rath W.A clinical ev aluation of controlled-release dinoprostone for cervical ripening—a review of current evidence in hospital and outpatient settings[J]. J Perinat Med,2005,33:491-499.
